User`s manual

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MELSEC
2 EMC COMMAND
2.1.4 Noise filter (power supply line filter)
A noise filter is a part that has a considerable effect in preventing conductive noise.
Except for a few models, installation of a noise filter to the power supply line is not
mandatory. However, the installation of a noise filter can suppress noise at a higher
rate (a noise filter is effective for reducing noise emitted in the range below 10MHz).
Use a noise filter equivalent to the models shown below.
Model FN343-3/01 FN660-6/06 ZHC2203-11
Manufacturer SCHAFFNER SCHAFFNER TDK
Rated current 3 A 6 A 3 A
Rated voltage 250 V
Precautions when installing a noise filter are noted below.
(1) Do not bundle the wiring on the input and output side of the noise filter. If they are
bundled, noise on the output side will be inducted to the wiring on the input side
where the noise has been removed by a filter.
Input side
(power supply side)
Input side
(power supply side)
Filter Filter
Induction
Output side
(device side)
Induction
Output side
(device side)
(2) Ground the ground terminal for the noise filter to the control panel using as short
wiring as possible (about 10 cm (3.94 in.)).